FIRAS HASHIM KAMAR, AURELIA CRISTINA NECHIFOR, GHANIM M. ALWAN,  MIHAELA EMANUELA CRACIUN, GHEORGHE<br>NECHIFOR <br>Comparative Removal of Lead, Copper and Cadmium Ions <br>from Wastewater in Single and Ternary Batch Biosorption <br>Systems onto Dry Walnut Shells

FIRAS HASHIM KAMAR, AURELIA CRISTINA NECHIFOR, GHANIM M. ALWAN, MIHAELA EMANUELA CRACIUN, GHEORGHE
NECHIFOR
Comparative Removal of Lead, Copper and Cadmium Ions
from Wastewater in Single and Ternary Batch Biosorption
Systems onto Dry Walnut Shells

Abstract:

The present study aims to evaluate the competitive biosorption of Pb(II), Cu(II) and Cd(II) ions by using dry walnut shells. Series of experiments were carried out in batch adsorption via single and triple system to study the effect of process variables on removal efficiency at range of 20 to 50 Co. The selected variables are: inlet metal concentration, pH, contact time and adsorbent dosage. The maximum removal efficiency at optimum condition in single biosorption system were: 86.16, 79.54 and 72.35% for Pb(II), Cu(II) and Cd(II) ions, respectively; these values increased in ternary systems to 58.46, 38.25, and 18.17% in the same sequence. Experimental data showed that the biosorption process obey the pseudo-second-order kinetics model. The thermodynamics parameters as Gibbs free energy change DGo, standard enthalpy change DHo, and standard entropy change DSo indicated that biosorption process was feasible, spontaneous and exothermic. FTIR spectroscopy analysis and Infrared spectrometry confirmed that the carboxyl and hydroxyl on the adsorbent surface were the major active groups responsible for the biosorption process. Keywords: bosorption; heavy metals; process variables; walnut shells

Issue: 2015, Volume 66, Issue 8

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